PHP unexpected multiple insert requests

I'm building a small web program which add comments on a web page.

When I was testing how the program run, there were unexpectedly many entry for comments.
2 to 5 insert requests were made by a single page request intended to insert one comment.

I tried to sort this out, but I spent hours in vain.

Finally, by comparing the source file which apparently run correctly, I've found out that empty references may be suspicious : like , or which is initially written in the html5 template I used.

I'm not sure what mechanism is working, but I've realized that what and how many requests are to be made when a user make request a web page.

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