Tampons coming out bent?

So I'm 16 years old and my periods have always been regular in time and flow. This week, my tampons have been coming out bent. What I'm finding even more strange is that the blood usually covers the whole tampon, but this week, it's been covering the whole thing except one vertical bar being left completely bare and white. I've checked for possible parts of tampons being stuck but there's nothing there. 

Does someone know anything that can help?

I'm new here and I don't know what information is required, so I hope I have provided an adequate description of my problem. 

Thank you in advance.

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