When working in a spreasheet, the borders are not saved properly. I must save under .xls and then import the file. Is there a simpler way?
We don’t know anything specific about your spreadsheet as long as you don’t tell us.
Always save in the native OpenDocument Format, then save in something else.
Suppose you are using double border lines?
If so it’s bug tdf#88827. The bug should be resolved in V5.2.4 or higher.
(Please always try to be precise. Always name the LibO version and in addition your OS where appropriate.)