Merge albums in boxsets

Hi community!While adding albums to the library some (very few) merged alone the different albums of a boxset or collection. The vast majority keeps the albums separated. How can I solve this problem? I have a vast number of multiple albums and this I find higly problematic. I upload screenshot witha successful merge.
Thank you

Hi @rigoletto73,

Does the tracks of those albums are located in folders named differently? (like CD1, CD2, etc…) ?