can any of you guys help me with this problem i have ? im

Hi can any of you guys help me with this problem i have ? im trying to add more items to my menu but it wont let me when i try to rearrange the menu i get a trail of empty boxes i thought it was because my wp memory had no more space but this isnt the case as iv contacted my host and got him to upgrade it to 3000 so im at a loss here and dont know what to do so i just thought of you guys hope you can help !