Is it normal for dispatch companies to keep changing your schedule… even after assigning holidays?

I’m still pretty new to being an ALT, so I’m honestly not sure what’s considered “normal” in this job yet. But something with my dispatch company has been throwing me off lately

They’ve been giving me schedules that show certain days as paid leave, and then later I’ll get an “updated” schedule where those same days suddenly become working days or subbing days. Usually these updated schedules happen suddenly and randomly. This has happened more than once now. And of course it’s happening right as the holidays are coming up, when I actually need to know what days I’m free so I can plan my time.

I’ve been asking them for a confirmed, updated schedule so I’m not guessing, but it feels like they change things whenever it suits them. And even when I push back a little, I get the usual “please excuse the inconvenience” message, but no real explanation.

Maybe this is just how dispatch companies work? But I kind of expected the schedule—especially anything involving paid leave—to be more concrete. It’s stressful not knowing if the schedule I have is even accurate.

Is this just part of being an ALT with a dispatch company, or is this a red flag? Anyone else deal with this around the holidays?