Left Ctrl + Left Shift + P doesn't work, but using Right Ctrl does

[ImAlsoRan]

I am having an issue with my Rosewill Fusion C40 keyboard. The issue is, when I try to use shortcuts that involve Control and Shift, and another key (let's use P for this topic), it will not register if I use the Left Control key. The position of shift doesn't matter. Here is a screenshot of me pressing Left Ctrl+Left Shift+P:

It doesn't register the P. However, I can use Right Ctrl, along with Left or RIght Shift, and it registers P, as shown here:

I really am at a loss here.

[seon123]

It's a membrane keyboard. Meaning it has 2 key rollover. If you press more than 2 keys at the same time, it might not register some of the keys. Which combinations don't work will depend on how they set up the membrane. 

[ImAlsoRan]

Just now, seon123 said:

It's a membrane keyboard. Meaning it has 2 key rollover. If you press more than 2 keys at the same time, it might not register some of the keys. Which combinations don't work will depend on how they set up the membrane. 

So this is just karma for getting a cheap keyboard?