Hallo nk63,

Falls wieder so etwas seltsames passiert mag auch das hier dir helfen:

Upload multiple modified objects to the server:

    Select multiple nodes, ways, or relations
    Click on File -> Upload Selection
    The following dialog shows the objects you've selected for uploading: 
https://josm.openstreetmap.de/wiki/Help/Action/UploadSelection

Fröhliches Mapping und schönen Abend,
Metzor