From a fitness perspective you’re doing so great though JasonTindallsTan and that’s a good overall loss since the summer. Keep going lovely, all the changes you’ve made will be doing so much good for your body and the scales will catch up soon.
I agree with what another poster said about building muscle as you would have been building a lot with what you’ve been doing the last 5/6 months and that may be screwing the scales (ie body composition, fat loss but muscle gain). The good news though is that muscle is the power house for fat burning so you’re on the right track and will balance out eventually!
Also, and this is just a guess, but with all the great steps and exercise you’re doing it looks a bit like endurance training, so your body may be conditioning / adapting to the endurance type output and with the report Mounjaropen posted perhaps this can trigger protection mode to preserve cals being burnt too much or too fast.
I haven’t done HIIT but heard good things about how it can ignite metabolic boost and fat burning. Maybe consider switching up the exercise with a break from high daily steps for a while and try some short intensive bursts instead, like HIIT, spin class or interval training. Or a different kind of exercise like swimming or box fit or something, to switch it up and get out of endurance mode (protect the fat) and into burning the stores. Just an idea though, I do think what your doing is amazing and you so so deserve good losses!