Can't hear my iphone 4 speakers when playing youtube videos?

Ok so recently I don't know why but when I watch a video on youtube, there's no sound coming from the speakers but instead I hear them from the phone receiver. By that I mean once the video plays I have to put my ear to the phone to hear the sound, otherwise I use my earphones. Now the speakers still work when I play a ringtone or a song but its just youtube that its decided to not work I'd appreciate any help please and thank you.

Added (1). Ok so still solution I don't have any audio managers nor I don't see much options for sound maybe I'm missing since I don't know but still nothing

If you have an audio manager on it, go to it and see if there are any speakers x'd out.

Check your audio

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