Issue with edge browser
TestComplete version 15.75 is supported, but we are experiencing flickering issues and dropdown selection problems in our application when using Edge version 140.3.
Forum Discussion
This issue was dealt with in the newest release of TestComplete. I was having the same issue with both edge and Chrome and there is a pretty popular thread from when the issue started occurring. You can update to the latest version but..there are other problems now as noted by MW_Didata and others.