Welcome to the forum!
Is there a requirement that the parking brake be set? That might cause what you are seeing.
What model and year is your RV, and what brand is the jack system? Is it a factory option or a aftermarket addition? No one here seems to have ESP, so without more details we can only guess.
BTW, we're having a little gathering of Thor Forum folks at Ocala Sun RV April 5-7. I started a thread here you can find by searching. We are expecting a Thor rep to come and answer our questions. Come and make some new friends!
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