InDesign forces line break - don't know why

i'm quite noob in indesign noob question. have file designer have make changes. life of me cannot find why indesign forces sentence on next line though there room in text frame... i've far applied basic paragraph style remove text attributes applied no avail. tried nonbreaking space (just forces previous word on next line) , checked text wrap (it's on "ignore" in text frame options), , there no tabs specified. thing 'fixes' when align text baseline grid or make new text frame , copy paste text it. _really_ want know causing this. ideas? or bug?

i presume talking 34% in first paragraph...

 

check see if balance ragged lines checked when open control panel flyout menu on right hand end, or inthe indents , spacing section of style definition. honestly< don't think should cause this, never know.

 

you have other "errors" showing in screen shot. it's poor form use empty paragraph spacing -- use space before or space after instead. in third paragraph you've got 3 separate paragraphs. select , delete 2 paragraph marks.

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