can you check if it is this your case?
https://issues.qgis.org/issues/15741
Luigi Pirelli
**
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* Mastering QGIS 2nd Edition:
*
https://www.packtpub.com/big-data-and-business-intelligence/mastering-qgis-second-edition
**
On 24 May 2017 at 17:25, Mark Dion wrote:
> Good morning,
>
> In the last week or so (had been conducting the same interactions for
> months) while editing a geojson linestring dataset, and deleting hundreds of
> features during editing sessions - QGIS began to arbitrarily delete desired
> features when attempting to save edits or stop editing/saving edits.
>
> I experienced this problem with 2.14 and 2.18 (after updating versions to
> see if this had something to do with it).
>
> Thank you,
>
> -Mark
>
>
>
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