We are in a collaboration with another group, and our PIs have several papers and ongoing projects together (I am a 3rd year PhD student). They are experimental, we are computational. Around 1.5 years ago, they asked me to model something, which I did. Based on the model, several very cool and important observations were made, and since also I did not stop at only what I was asked for, but dug deeper, I managed to set up several interesting hypotheses. All of them are being tested, as they found them to be important questions.
On one of the first things we wrote a paper (I have shared co-authorship). I made all the figures of our models and several other panels, which were all to support or analyze these models. I spent days over a few weeks developing them (I am picky with colors, making sure they are accessible for colorblind people, things are aligned, fonts, etc.). Everybody said they were beautiful.
Fast forward, this paper came back from review. We agreed how we will rearrange some of the panels, move to supplementary or add. I again spent a day just to recolor things (one of the reviewers did not like one of the colors, and although exporting the figure in higher resolution would have solved the problem, we decided to make sure that they will like it, and changed it. But since these colors are used consistently across panels, almost all of them needed to be changed to accommodate this.) After the weekend, I needed to spend 2 days with preparing for a one-day retreat, so I could not immediately make everything.
After I came back, the collaborating PI asked me to meet with him. In the meeting, he showed me new figures - where he changed almost all of the panels that I have made (not just recolored, but remade from scratch using my models, except for one, that he also wants to alter). I did not confront him, as I felt very uncomfortable and quite upset and also realized that he does not have the slightest clue that this might be a problem. I needed to tell him however that the colors that he chose are almost indistinguishable from each other. His intention of remaking the panels was not discussed beforehand.
I told this to my PI, who immediately said that this is not okay, she knows that I have spent tons of time on this (this is a side project, but took away quite significant time from my main one). Later the day, she told me that she spoke with the other PI and told him that at least he should apologize. I met with him in the corridor later, but he did not mention anything about this, just asked me to send an editable format of the last of the former panels. I did not yet tell this to my PI, I do not want to tell on somebody else anymore.
I do not know what to do. We have several ongoing projects but I feel micromanaged and my time and effort disrespected. Honestly, I am very upset and feel like being used as a kind of a result producing machine. I also do not think that from a management point of view this is okay from a PI, especially if he is from another group, altering the representation of results that is coming from outside his group.
I would like to ask for suggestions. Should I just drop this matter, and at most only dump the future results on him and let him do whatever he wants? I can make more drastic measures e.g. dropping all the future collaborations but I would feel that I am overreacting. What do people think?
EDIT: His figures are not of better quality. He removed information from the figures (both scientific, and e.g. labels that help the reader to understand the figure by a glance). We needed to convince him not to use red-green on the same figures to highlight differences. For the results, that came from our lab, we need to fight for every label and legend to get them included and consistently colored, and his colors to be explained in the legend. He feels free to just simply neglect our comments and requests on the visualization on our own results (especially when I and not my supervisor is asking, but sometimes he also tries "not to hear hers).