I am having the same problem with the Sesto Senso focuser.
When I command a position X outwards from the current position Y it goes to the position X but then goes back to Y-100.
I have the latest sesto senso 2 firmware 3.05.13 (that I had to update with Primaluce PLAY on my WIN10 PC laptop using a 10 m USB cable !!!!).
Stellarmate is also up to date at vs 1.7.9.

The sesto senso was working perfectly with the original firmware before I updated stellarmate recently.
What should I do to make it work again?

The picture shows the result of enter step 20000 from an initial position of step 10000