The speaker's sound is delayed compared to the TV, when the speaker is connected with TV via Bluetooth
Generally, Bluetooth speaker products are designed with a primary focus on sound quality. This can cause a sound delay when used as TV speakers, depending on Bluetooth signal strength, sound quality of the content being played, etc.
If the delay is disturbing, please connect the speaker to the TV using a stereo cable, to the "AUDIO IN" port of the speaker.