Line still appearing but not existing in the metadata of a shapefile

Question

For a project, I had to merge the cells of a grid to upscale it. It was possible to merge all I wanted but there is kind of a displaying problem: there is this line which appears visualy but that is not existing in the metadata or anywhere (see below, as you can see there are 2 undesired line, the first on the column of the selected cell and the other one more on the right)

What is weird is that when I select the cell, it is selected as one cell as if this line doesn't exist. Same in the metadata, there is no information about this line.
It is not a problem for my analysis as this line doesn't really exist but I would like to display it properly so would you have any suggestion on how to erase (even manually), this line?
Cheers

TeddyTedTed · Answer

Based on the comments the features which have the line through them are multipart features. These are single features with multiple geometries.
If the different parts of the multipart features are touching perfectly then using the Vectory geometry > Fix geometries should merge them together into a singlepart feature.
EDIT:
If that doesn't work then go to Vector > Geoprocessing Tools > Buffer and buffer it by 0, see if that works.

Line still appearing but not existing in the metadata of a shapefile

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