Could be paint incompatibility, moisture, no primer or bad prep work.
Older houses were painted with oil paints. If the walls weren't primed prior to transioning to latex, you will have issues. If the paint peels off all the way back to the plaster, could be a lack of primer.
Older houses were painted with oil paints. If the walls weren't primed prior to transioning to latex, you will have issues. If the paint peels off all the way back to the plaster, could be a lack of primer.