OK, open the text in the original app (Word? or whatever) on the original platform (PC? or whatever). If all looks good there- that is the indents aren't showing there but bold, italics, etc are- export from that platform as RTF file. That will simplify the file format down to the basics. Then try opening the RTF version in Pages.
If that still has the problem, run the content through various text "cleaners" that strips out hidden formatting but leaves visible formatting alone. I use a free tool called WordService from the App Store, which then makes tools like those available in the "Services" menu item. Several of those tools can easily strip out some hidden "kludge" that may be causing this effect.
And with some of the text selected, you might also want to check both of these to be sure neither shows a number greater than 0...
That second one can- in some situations- show no bullet but be indenting a line anyway because- as shown there, Indent bullet or text has a number in it (.25 inch in that example).
And if all that has failed and you still have the problem, create a one page copy of the document, replace any sensitive text with Lorem Ipsum gibberish, save it as a file that one of us can download and open and then we will be able to figure it out.