I've been having this issue with unwanted hyphens for at least a couple years.
They appear when copy/pasting from Word, but not every time or even half the time.
They appear even when hyphenation is turned off in InDesign.
They appear where a hyphen would properly occur if the word were split.
They don't correspond to any breaks in the Word document.
If I paste text and the hyphens appear, I have to re-copy and re-paste the same text and to get rid of the hyphens.
Don't use copy/paste...use file>place. If there's that much in the file you don't need, then place it into a different InDesign file.
One more thing...do not use fake Word files saved from other applications such as Google Docs.
Before you use Word texts in InDesign, turn off auto hyphenation and remove all manual hyphenation.