C1 shows multiple keywords in TIFF-files

Hello,

could somebody explain to me why C1 V7.0.2 - Win7 64bit - often shows double oder multiple keywords in my imported TIFF I tagged in Lightroom 4? I guess it makes no difference whether I use sessions or catalogue and I had this mistake even in V6. After cleaning unused words, sometimes they appear after I restart C1. 🤓 In the options I choose XMP full synchronization.

Marco