Originally Posted by
mtttt
I booked a ticket online, but there is a slight error in the name...
my middle name was repeated twice, but all other details are correct
for example (these aren't my real names)
actual name: Paul John Smith
name on e-ticket: Paul John John Smith
Do you think this will affect my journey? I'm interchanging... so if there is going to be a problem, I'll have 4 to deal with

Unlikely to be a problem. If anything, it's more likely to avoid the worst of the worst of problems related with the TSA.
If your first middle middle and last names were all the same (e.g. Abdullah) or you just used a single name (as is common in some parts of the world), then that may be a different thing.
The TSA has more issues with all names being the same (or only one name) than names being repeated but having a variety of names within a full name.