try to manipulate slider step

templates/client/default/assets/js/layers-ui.js

@@ -16213,7 +16213,7 @@ var __WEBPACK_AMD_DEFINE_FACTORY__, __WEBPACK_AMD_DEFINE_ARRAY__, __WEBPACK_AMD_
 			if (val >= this._valueMax()) {
 				return this._valueMax();
 			}
-			var step = this.options.step > 0 ? this.options.step : 512,
+			var step = this.options.step > 0 ? this.options.step : 1,
 			    valModStep = (val - this._valueMin()) % step,
 			    alignValue = val - valModStep;
 

templates/client/default/ui/core/default/widget/forms/fields/range.tpl

@@ -35,7 +35,7 @@
     <input type="range"
            id="{$rawObject->getId()}"
            name="{$rawObject->getName()}" min="{$rawObject->getMinValue()}"
-           max="{$rawObject->getMaxValue()}"
+           max="{$rawObject->getMaxValue()}" step="512" 
             {if $rawObject->isOutputVisible()}
             oninput="output{$rawObject->getId()}.value={$rawObject->getId()}.value"
            {/if}