DD-WRT bandwidth divide between 2.4 GHz and 5 GHz band

I have just flashed DD-WRT firmware in place of my TP-Link Archer C7's stock firmware.

I have tued on both bands. I can't use only the 5 GHz band because some devices don't support it. I have 100 Mbps connection. After setting it up, at first, I thought that I was only getting 50 Mbps due to poor connection, etc.

But after tuing off 2.4 GHz, I noticed that the WAN bandwidth was dividing between both bands (50 Mbps + 50 Mbps). However on stock firmware, it wasn't the case.

How can I make it so the WAN bandwidth is not divided between both bands this way?

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