Synchro not working anymore from LR Web to LRC

Hello,

Since several month, synchro from LR web to LRC does not work.

I synch collection from LRC to LR web and all is ok (green flag on LRC and nothing on diagnostic report).

Now If I change color, marker, keywork, star, on some photo directly from Web, nothing change in LRC.

I can receive comments and hearts (but without yellow badges as before).

Same issue with LR. I can change parameters or markers with LR  but nothing change on LRC, even after one day.

Seems that synchro work only on one way ? from LRC to web and that's all ? any idea ?

Thanks

Hervé