There seems to be a major bug in the backend, I can duplicate this on two different websites, including the default website (9.0.1.5867) which has no customization. I am using the following versions.

9.0.2.6218
9.0.1.5867

Both versions produce the same results, video is based on the second version (9.0.1.5867).

To reproduce the bug follow the following steps

#1. Log into the backend as administrator
#2. Click the manage link on the left-hand side in the event you're not there by default
#3. Click on any order waiting to be processed
#4. Click the more button on the upper right one time (see what happens)
#5. Click the more button on the upper right the second time (see what happens)

You can also see it in the video as well. Seems to be an undefined tab problem.

Hope this helps.
-Ray
2020-10-04_5-34-52.zip (2,273kb) downloaded 9 time(s).

Edited by user Sunday, October 4, 2020 4:53:53 AM(UTC)  | Reason: Not specified