Multiple files with the same name and a tilde are written while editing a file with gvim

I am under fedora 29. I edit my files with gvim and since a few days, one of them appears multiple times, renamed with an additional letter and tilde. The directory looks like this : sf1.pdf sf1.tec~ sf1.tef~ sf1.tei~ sf1.tel~ sf1.teo~ sf1.ter~ sf1.teu~ sf1.tex sf1.tez~ sf1.nav sf1.snm sf1.ted~ sf1.teg~ sf1.tej~ sf1.tem~ sf1.tep~ sf1.tes~ sf1.tev~ sf1.tex~ sf1.toc sf1.aux sf1.out sf1.teb~ sf1.tee~ sf1.teh~ sf1.tek~ sf1.ten~ sf1.teq~ sf1.tet~ sf1.tew~ sf1.tey~ Apparently the whole alphabet is doing something here, but I really don't udnerstand what's going on (I don't even know what context to provide for more details !). If anyone has a clue as to what's going on and how this could be stopped... Thanks a lot ! Marc