breeding

Question
Hello,
I have only been breeding pigeons for about three years now.
In order to explain my curiosity.
I had a pair of rollers. The female disappeared one day (probabably a hawk). A few days later a female homer showed up at my loft, and before I knew it they were sitting on eggs. The eggs hatched (half roller, half homer) and will soon be a year old and are doing fine.
OK, here we go. the male roller (father to the roller/homer cross birds) disappeared too.
Now the homer (mother) has mated with one of the roller/homer birds.
They mated once this month and she laid two eggs but they were not furtile.
Now they have mated again and I noticed them sitting about a week ago.
The thing is, there are four eggs.
I need to mention that I only have the three birds: the original homer that showed up and the two roller/homer crosses. I know one is a male. I'm not sure about the other (although I think it is female) because it has never mated.
My question all boils down to why is there four eggs? I have never heard of this happening before, I have a few ideas, but then again, as I said I'm still pretty new at this.
What do you think??

Thanks in advance,
Debora

Answer
Assuming you threw the last infertile eggs out, you obviously have 2 hens!  I have never done it, but there are fanciers who use two hens per male.  Don't know how it works!  Let them go and see what happens; just be aware that if one hen gets ran off and all 4 hatch, they will not be able to keep up feeding that many after the first week, you will have to help.  Also, if they were layed at different times, could be a mess.  Better keep a close eye on the situation.

Keep  me Posted!

Dave