Morning Salah Piroty

I am so sorry to hear your upgrade has caused you such issues. 

While I am struggling to fully appreciate the context of what you are trying to describe, I am aware of a some right to left changes made while in the editor view.
Details of which can be seen via the release notes: https://gateway.rws.com/csm?id=kb_article_view&sysparm_article=KB0027380

Questions:

What languages do you typically work with?
Is it an actual error your getting? 
Or is it simply strange behaviour where you imply the "target language side mixes the translation memory somehow make it backward"? In which case a screen print if possible would be very helpful?

Uninstall CU:

However, yes in the interim you can uninstall just the most recent update. 
This can be done by following these steps:

1. Go to Control Panel - Programs - Programs and Features
   
2. On the left you will see: Installed Updates
3. Locate the CU 
4. Top tool bare you will see: Uninstall 

Moving forward:

While going back to a previous version may resolve your current concern, it would only be a temporary solution.
Ideally you should benefit from the recent CU, so we need to get it installed and working again.

We can support you in this by better understanding your current circumstances starting with the questions listed above.

Looking forward to any ongoing clarity you can offer 

Lydia