Desktop Client reports wrong files size

Hi , i have a Nextcloud server 15.0.2 with, php 7.3, mariadb 10.3, debian 9. I install lastes client (2.5.1) in windows 10 (1809) but it changed the size of files from MB to GB. For example if i have a folder with 623 MB the client show me 623 GB. If the folder have more than 1 GB its shows the correct size. Only change files with size in MB. I install older client 2.3.3-1 and there’s no error. Sorry for my english. I hope can help me
alex out