Obtaining incorrect results on changing the train test split ratio

[prakhardg]

If the test ratio is changed to 0.3, it shows all the files as benign, if changed to 0.2, it shows all to be malicious. Can you please suggest to improve the same?? I am selecting the following features using extratrees classifier with n_estimator value = 100

['DllCharacteristics', 'Machine', 'Characteristics', 'SectionsMaxEntropy', 'VersionInformationSize', 'ImageBase', 'Subsystem', 'MajorSubsystemVersion', 'ResourcesMinEntropy', 'SizeOfOptionalHeader', 'ResourcesMaxEntropy', 'MajorOperatingSystemVersion', 'SectionsMinEntropy', 'SectionsMeanEntropy']