HI
Version 3.89
My first impression was that things were working OK but I was using a clip with little movement but having changed to a clip with a lot of right to left motion...
Yes.....It's the last clip split off that, when reversed is changed to the first clip reversed. 
The thumnails also revert to the first clip thumbnails.
How much of the first clip is seen depends on the duration of the actual last clip.
However, whilst looking for a possible workaround I found the reversing option seems to be quite messed up....viz...
e.g. with a clip split into 5 clips...
If you reverse the first clip it becomes the last clip! (limited by duration)
Reverse the second clip it becomes the last clip! (length, again dependant)
Reverse the third clip it becomes the last clip!
Reverse the fourth clip it reverts to the second clp
Reverse the last clip and it becomes the first clip.
Same thing if you reverse clips in storyboard mode.
Preview a clip from the media list and trim a bit from the start with the IN/OUT markers and the green arrow and it still reverses to a section from the end of the original clip.
It's a bit of a mess and needs looking at
One workaround is to add the whole clip to the timeline and reverse it.
Split the reversed clip where you want the reverse to finish and delete the remainder leaving your reversed clip. Now re-add the full clip again and repeat where needed. Your reversed selections should stay reversed.
Nat