Give us some hints on your process.

How do you clean before resist application?
How are the panels handled after cleaning, and before resist application, or
are they handled at all?
Do these problems occur on smooth Copper foils too?

These rough resists, DT, RTF, etc, usually adhere to resist better than
smooth foils, but if they become soiled by handling, etc, the soils can, in
certain cases, be more difficult to remove, as they are better bonded, and
when this happens the resist bonds to the soil (not well) instead of to
Copper.

Rudy Sedlak

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