Why do I hear water in my bathtub when toilets are flushed? Is this a major problem?

Is it a gurgle, likely a partially clogged vent stack. Major problem, no not now but later yes.

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Originally Posted by sami jack

Why do I hear water in my bathtub when toilets are flushed? Is this a major problem?

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Bob's bang on! The gurgle you hear is the toilet attempting to bent through the tub trap. The solution would be to snake the lavatory vent from the roof.
Rent a sewer machine,(see image) and send the snake down the vent until it reaches the base and 16 more feet. Good luck. Tom