GPS - Swim 2 vs 5X PLUS

I have 5XPLUS

Girlfriend swim2 GPS+GLONASS A beautiful GPS trail:

(Start and finish are always from the same place.)

We were swimming at the same time. Literally one after the other. And the graph 5XPLUS looks like this:

Only GPS: (Start and finish are always from the same place.)

Other GPS options: (Start and finish are always from the same place.)

GPS+GALILEO

GPS+GLONASS 

All activities are a crawl.

My question ... What the f*** with this GPS for 5XPLUS?

They should give money for the watch. I will add that i.e. my second watch.
First, they exchanged for a faulty GPS - I proved.
Second gear, suddenly the LAP button broke. The second year passes and the GPS is still terrible - just swimming.