Hello walderpeee. My first thoughts are that you sound as if you have a very sensible and pragmatic husband. It is always best to have these things checked out so that you know what it is that you are dealing with.
My second thoughts surround my enthusiasm for irrigation and you might be right about that being the solution to your present problem. I irrigate every night and on several nights I believe that there is no 'real' output other than that water which I had just pumped into the stoma. It seems somehow reassuring that the water goes in and comes out over time, even if there does not appear to be anything else alongside it. I feel that I have done 'my-bit' and anything untoward that happens is therefore not my 'fault'. Occasionally, I take Metamucil so that I can be sure that the input equates with the output. After years of having mild concern about these things, I now just take it as it comes and observe the output rather than worry about it.
If you are not having any pain, then there may not be too much amiss. However, anxiety/ worry/ angst, or whatever you like to call it can sometimes be eased by getting a proper diagnosis so I refer back to my first thoughts.