Yellow is, pretty much, the color you designed for merge conflict & warnings.
When I'm merging/clicking merge, I'm already sure that I've reviewed the code, & reviewed/fixed the merge conflicts. I don't need a button to remind me about a non-existent merge conflict/warning...
Please consider reverting it to the previous color; use the standard Atlassian blue color for buttons, or use a more positive color like green. This is totally unusable right now.