Arabic fonts; XB Shiraz/XB Sols; dots and other signs half disappearing.

Recently I've been typing some Arabic texts and I've been faced with some issues.

When using the XB Shiraz font, some dots disappear. I've tried augmenting spacing between lines but they won't reappear.

I've encountered a similar problem with kasrah while using XB Sols. In the image you can see Shiraz up and below its equivalent in Sols, with the almost completely concealed kasrahs.

Do you have any suggestion on how can I fix this? It isn't an issue only with these two fonts, it also occurs with any font which reaches a little to low below a normal Latin script line.

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