Pretty basic question, anybody can explain ?

On Monday I bought ZYZ stock.

After hours: TWS showed bid: 32.30 ask: 32.38 And it was not changing all the time up to 7pm.

At about 5pm I went to check news on Yahoo Finance for this XYZ stock and saw after hours the stock jumped 1.5%

Anybody can explain this ? I would appreciate it. Thanks
 
Well it is not an actuall ticker of course. My point is that on Monday the stock jumped after hours 1.5% from the monday's closing price according to Yahoo Finance.
But I did not see any change in price in my TWS. Is it possible ? Why it is so..
 
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