It looks like sunburn to me. Was the sun reaching them there?
I wouldn't worry much then. They like bright light, but no direct sun, especially in Portugal or Spain. The leaf will fall off eventually and those buds too.
Now that you moved it inside all buds might die (blast). Don't worry about it either :) They do that sometimes when they are moved while forming buds. That's how they react when the conditions change.
How many flower spikes it has?
I took today more photos... and probably I will post them these days, I saw that not just that one leaf is affected 😱
and now the change is not making it any favour, too warm inside the living room.
hope the orchid lovers will not cry at the scene hahaha 😂