If you have more objects on a parcel than the parcel size allows, the excess objects will disappear on Monday, February 2.
To check, select a parcel and choose “About Land” and “Objects”.
The object limit is based on total parcels you own in a region (sim) even if your parcels are not connected.
If you are over your object allocation on February 2nd, the system will automatically return objects to your inventory until the proper allocation is reached. The most recently created objects will be removed first, starting with those belonging to visitors, followed by objects owned by groups, and finally moving on to your objects.
For information about the timing link here.
For more information - including the limit of objects per meter - check https://secondlife.com/updates/.