I actually removed all JS features..
– JS minify
– JS Combine Files
– JS Files Deferred
starting at the bottom with deferred, there was no change, then combine files, no change, then finally Minify it worked. It may have only needed Minify in the end. But I didn’t test that far. I just left it.
Weird though, as the issue was definitely only across Firefox and Chrome… Safari was showing no issues.