Figure is leaving a large gap when moving to next page

Any idea why there is a large gape between the top of the page and the figure as can be seen in the image below. I can understand that the figure is moved into the next page because space isn’t enough but why is leaving the gape. Also, what is the best option to use for figures in between paragraphs to stop this issue from happening please? Many Thanks

subsection{Experiment 6}

begin{figure}[ht]
begin{center}
includegraphics[width=0.7textwidth]{images/image_filtering.png}
end{center}
caption{}
label{fig:image_filtering}
end{figure}



begin{figure}[ht]
begin{center}
includegraphics[width=0.7textwidth]{TesnorBoard_Graphs/Exp06_Tensorboard.png}
end{center}
caption{}
label{fig:exp06}
end{figure}