(Web Desk) - The streaming service often shows a song's original lyrics, which can include racial slurs and swear words, on screen when the clean 'radio friendly' version is played.
The BBC found the issue occurring with dozens of big songs by artists like Dua Lipa, The Weeknd, Drake and Lil Nas X.
Spotify declined to comment.
The BBC understands the company is aware of the problem and working to fix it.
Spotify introduced a system designed to deal with explicit content in 2018 after parents put pressure on the company, and explicit songs are marked with an 'E'.
Anyone who wants to avoid hearing swearing can choose to block explicit content in their settings, and clean versions will often be offered instead.
However, the lyrics in Spotify's database for many of these edited versions can be the same as the originals, meaning anyone looking at the lyrics will see the explicit words.
Spotify appeared to remove lyrics for a small number of songs on Wednesday after being alerted to the problem by the BBC.
The BBC has also discovered that on desktops or laptops, people can still read the lyrics of explicit versions of songs even when the tracks are blocked, simply by clicking on the track names from a search or artist profile page.
Spotify is the world's most popular music streaming service with more than 500 million users.