App is hiding specific contents of protected pdfs

When I'm opening my security contract notes, it just shows the headlines and borders, but the bill details not visible. The pdf used to be a password protected document, first I thought it is the problem from my broker end, generating the pdf, but then I opened it in Google drive and wps office, it was showing everything on the page , ehich were invisible in adobe. I'm unable to share the pdf as it is confidential, but the problem is genuine and adobe has to take care of this.