4H Candles differ during winter/summertime

Hi guys,

On my broker platform IB the 4H Candles will cover different time-frames depending on summer/winter time
(e.g. 2300-300 EST, vs 0-400 EST) - I am in GMT myself, so with the candle closing at 400 it covers the London open, while the other does not!

Is this something totally dependent upon my broker platform, is this something everyone deals with? Do you make adjustments or just trade the chart ignoring this (maybe important) difference?

Thanks so much for anyone able to shed some insight on this for me!