I am re-painting the bathroom wall next to matching colour as until that time, but the out-of-date paint is blistering of on roller? Does anyone know why this might be?

Does anyone know why this might be?
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Answers:    Let what you have done dry and prepare the surface. Remove flaking paint sand the surface and use a recommended seal coat and then paint.

Ex Painter.
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You enjoy to find out why the old paint is blistering. Is it mold? or age? This has to be fixed back you paint. If you paint over dirt, mold, scum etc,. it's resembling painting on a removable motion picture.If it isdirt or scum, verbs with TCP. If it is mold, you enjoy to find something that will not only put to death the mold, but remove it. Then the first cover of paint should be KILZ.