Supports issue in base

Hi all, I’m having a strange thing happen with my supports now and again and I’m not sure why.

I’m finding that sometimes when the first layer is going down the base of the support is somewhat transparent. Now I’ve printed these models many times without this problem but every now and then this happens with supports.

I have a theory but could be wrong as I’ve not fully noted this. I’m wondering if it could be the fact I’m printing this on a bambu printer and then sometimes in a U1 and visa Versa, I could be totally wrong if course but I have also noticed files I have previously printed a few times in my bambu printer have not adhered to the bed in the snapmaker U1 and the only way I can get it to print is to cut a small section off the base which isn’t ideal really.

I have uploaded a picture of the base of the support in the hope someone with more knowledge than I have can advise me. Unfortunately the pictures in showing this is happened on the U1 as I popped to have dinner earlier so never noticed till I returned to the printer.

Support Initial Layer Density. It defaults to 90%. You can change it if you prefer.