Weeing where they're sat?

Does anyone else's rabbit do this and is it normal?! I'm pretty sure it's Skye - I've had to take out the bed box off their platform in the shed as she just kept weeing in it so there'd just be a pool of wee in the corner. This morning, there's no wee there but Skye was sat at the top of the ramp relaxing when i went out to give them breakfast, then I noticed there was a bit of wee dripping down the wall of the shed, a dried bit on the floor and a dried bit on the edge of the platform where shed been sat so she's obviously weed there but as there's a gap at the edge it's run off the platform and dropped onto the floor Is a litter tray on the platform the only option? Don't see how I can stop her? They had also been weeing on the step I made them as I'd carpeted it but as soon as I removed the carpet they stopped. I thought if I removed the bed box she'd stop but she's obviously just doing it where she's sat

could be just a spot she likes to wee in, and got used to her own routine