In fact we have a double problem

It's not often you come across a Mandela Effect as complicated as this one.

The issue is around the phrase "Houston, we have a problem".

It was first heard in 1970 in the audio recording of the moon mission of that year, when the astronauts were telling NASA about the explosion on their spacecraft. Some claim it was in fact "Houston, we've had a problem." So far so good ... but then the movie of this event, Apollo 13, was made in 1995 starring Tom Hanks, Ed Harris, Bill Paxton and Kevin Bacon. Some people are not only saying it changed in the movie but it actually changed back again - "flip flopped" - as it's been described. Then, some are claiming the original audio flip flopped too.

It's an iconic phrase to which many references can easily be found. Plus, it's our old friend Tom Hanks featuring in yet another MMDE.

Wikipedia

The Wikipedia explanation makes it clear that the movie changed it from the original, but that doesn't help those who really do remember the original and movie being the same. It's reported there that the exact words said were "Okay, Houston, we've had a problem here":

02 07 55 19 Haise: Okay, Houston (interrupted by Swigert)

02 07 55 20 Swigert: I believe we've had a problem here. (interrupting Haise)

02 07 55 28 Lousma: This is Houston. Say again, please.

02 07 55 35 Lovell: Houston, we've had a problem. We've had a main B bus undervolt.

-- Official NASA "Technical Air to ground Voice Transcription

This is one of the most well-known Mandela Effects, as is it's alleged "flip flop". The interesting aspect to this is that the people reporting the change say it did for them at different times, in fact over a period of several years. It was already being discussed as a Mandela Effect when it flipped over.