Pretty common problem with LEDs. The TSM, or TSSM, doesn't like the difference. You may have to put an equalizer on them. I've not had the problem myself but I've heard about it. Try searching for that issue and what others have done. Also look at how to run Diagnostics on your bike and see if it's throwing a code. Someone with more knowledge will chime in soon. Good Luck!
Your Turn signal module monitors the electrical lights load on the lines. You have reduced the electrical load by installing the LEDs so it pops a trouble; code. You need to add some load to resolve the issue.
BikeTronics makes a "Load Equalizer" for just this purpose. There are other load equalizers available on the internet for the same purpose.