Inconsistant Bracket Using Zotero IEEE referencing on Word

Ive been writing on word with multiple citations. However, i noticed that the citations bracket behaves inconsistently.

Some of my citations uses this "-" For examples, "[6]–[8]", "[12]–[14]" etc.

Then there are times, it give out "[15], [16]", "[9], [10]".

What can i do to make it more consistent?
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