Wow! That IS massively off line. Mine is nowhere near as bad as that. It’s not quite as close on as David’s example from the next post, but it’s a lot closer to his than it is to yours.
It’s hard to say whether that is a Zwift issue or a Strava one. I’d probably log a ticket with Zwift Support first and see what they say, then if that doesn’t get you anywhere, go with Strava Support after that.