Delete initial added linebreak in MOBI entries

[Musrar]

Is there any way not to add this extra linebreak that appears at entries when files are converted to MOBI?
Here's the original dictionary:
Dizionario JP-IT.zip

For comparison, an image comparing it to a "native" kindle dictionary, which hasn't it:

[ilius]

There are no linebreaks/newlines at the beginning of definitions in this glossary.
No idea why it shows it that way.

[ilius]

You can convert to .df and see the content with a text editor yourself.