Any idea what would cause fresh paint to bubble like this?

[ElCI]

Hi all

Did 2 coats of paint on this wall last night without any real issue. Wife decided she didn't like the colour so doing a coat of a different colour (but same paint type) tonight. This one wall now has 3 bubbles in it.
The other side of this wall is ensuite shower so a little concerned this is water related but just thought it was weird it was fine last night.
Never seen this happen when painting before so just wondering if it's normal or if any reason for it?

 

[Wayners]

Second coat applied too soon although your got away with it.
Then you probably needed 24h or more to fully dry especially with the damp weather.
Then a third coat livened up the first two and you got bubbles.
Let it dry off for a couple of days. Repair bubbles and spot prime.
Paint again.
I'll guess it's a durable emulsion as the cure/drying times are way longer than standard emulsion

 

[ElCI]

Second coat applied too soo although got away with it.
Then you probably needed 24h or more to fully dry especially with the damp weather.
Then a third coat livened up the first two and you got bubbles.
Let it dry off for a couple of days. Repair bubbles and spot prime.
Paint again.
I'll guess it's a durable emulsion as the cure/drying times are way longer than standard emulsion

That makes sense, thanks. I did rush the second coat last night to get it done before bed